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Bump receive buffer size up to the maximum DMA burst boundary.

This commit is contained in:
pk 2000-02-14 17:14:28 +00:00
parent a1b5434cec
commit 1d373a94e2
1 changed files with 6 additions and 2 deletions
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8
sys/dev/ic/hme.c
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@ -1,4 +1,4 @@
/* $NetBSD: hme.c,v 1.7 2000/02/02 17:09:47 thorpej Exp $ */
/* $NetBSD: hme.c,v 1.8 2000/02/14 17:14:28 pk Exp $ */
/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
@ -177,9 +177,13 @@ hme_config(sc)
* eg. use things as `dma_load_mbuf()' on transmit,
* and a pool of `EXTMEM' mbufs (with buffers DMA-mapped
* all the time) on the reveiver side.
*
* Note: receive buffers must be 64-byte aligned.
* Also, apparently, the buffers must extend to a DMA burst
* boundary beyond the maximum packet size.
*/
#define _HME_NDESC 32
#define _HME_BUFSZ 1536
#define _HME_BUFSZ 1600
/* Note: the # of descriptors must be a multiple of 16 */
sc->sc_rb.rb_ntbuf = _HME_NDESC;